O-200 engine mounts

Dumb question but I don't have an example to look at. Have an O-200 that we rebuilt and the kit came with 16 rubber pieces for the mounts; 8 external with their special washers and 8 conical. These are for two different installations and are not used together in the mount bosses right? Its just that the conicals seem to fit inside the others but there doesn't seem a reasonable way to get them in the bosses, with the tubes inserted, without allot of swearing. If that is how they go how the heck do you get them in?

It's these type of things that make me wonder if I should even be a builder.

Thanks

For the conical mounts the engine lugs have cones in them. When the engine is mounted it is real solid.
The liquid filled rubbers have metal bushings with peaces of rubber hose pressed over them. The hole in the lugs is way big then a liquid filled doughnut goes front and back with the big washers on the out side. The engine is mounted real floppy if you pull on the prop of a Cessna 150 the engine will move about 1" in any direction. When you fly a Cessna 150 with the big spinner you can see the spinner move a lot in relation to the cowling in any turbulence.
The difference in the two systems makes the design of the cowling and baffling critical.

Thanks for the quick reply. What does the rubber hoses pressed over the bushings accomplish? I didn't put the hoses on but can pull them to do so.

Originally Posted by toweym

Dumb question but I don't have an example to look at. Have an O-200 that we rebuilt and the kit came with 16 rubber pieces for the mounts; 8 external with their special washers and 8 conical. These are for two different installations and are not used together in the mount bosses right? Its just that the conicals seem to fit inside the others but there doesn't seem a reasonable way to get them in the bosses, with the tubes inserted, without allot of swearing. If that is how they go how the heck do you get them in?

It's these type of things that make me wonder if I should even be a builder.

Thanks

If you have an engine with straight mount holes with a small step in their outer edges, use the mounts as shown below:



If you have an engine that has its mount holes tapered on front and back, use these:



Don't try to fit parts from the two systems together. They're for totally different setups.

Dan

Thanks, thats what I did though I didn't have the sleeves for the bushings. I guess I could make some but what is it for so that I can get the right material?

Originally Posted by toweym

Thanks, thats what I did though I didn't have the sleeves for the bushings. I guess I could make some but what is it for so that I can get the right material?

You might be fine with the bare steel sleeves. They're for spacing between the outer washers to get the necessary rigidity for the bolt/nut assembly. Make sure you torque the bolts to the proper value, and don't overtighten them.

We use new mounts every time we change an engine. We have all Lyc's, and it's been a while since we did an O-200; got rid of the 150s. Sometimes the Lyc mounts come with the liquid-filled rubber damper on the sleeve, sometimes they're just bare sleeves. Seems to me the Barry brand is bare, while Lords have the damper. On the O-200, the rubber sleeve would act only to stop the steel sleeve from chafing into the aluminum engine lug, something that can happen as the mounts get old and sag. If you were to stick rubber hose that was too fat on the sleeve, the shock mounts couldn't do their job.

Dan

What is the proper torque for the bolts? I found a reference stating 180-190 ft-lbs but that seemed rather high,

mt

Originally Posted by toweym

What is the proper torque for the bolts? I found a reference stating 180-190 ft-lbs but that seemed rather high,

mt

Read that reference again. Mine says 180-190 inch-pounds; 180 inch-pounds is 15 foot-pounds. Not a lot, but anything more will damage stuff.

Dan

That sounds much better. Thanks for all of your help.